<template>
  <div>
      <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>权限管理</el-breadcrumb-item>
      <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图 -->
    <el-card>
      <!-- 添加角色按钮区域 -->
      <el-row>
        <el-col>
          <el-button type="primary">添加角色</el-button>
        </el-col>
      </el-row>
      <!-- 角色列表区域 -->
      <el-table :data="rolelist" border stripe>
        <!-- 展开列 -->
        <el-table-column type="expand">
          <template slot-scope="scope">
            <el-row :class="['bdbottom', i1 === 0 ? 'bdtop' : '' , 'vcenter']" v-for="(item1,i1) in scope.row.children" :key="item1.id">
              <!-- 渲染一级权限 -->
              <el-col :span="5">
                 <el-tag closable @close="removeRightById(scope.row , item1.id)">{{item1.authName}}</el-tag>
                 <i class="el-icon-caret-right"></i>
              </el-col>
              <!-- 渲染二级和三级权限 -->
              <el-col :span="19">
                <!-- 通过for循环 嵌套渲染二级权限 -->
                <el-row :class="[i2 === 0 ? '' : 'bdtop' , 'vcenter']" 
                v-for="(item2 , i2) in item1.children" 
                :key="item2.id"
                closable @close="removeRightById(scope.row , item2.id)"> 
                  <el-col :span="6">
                    <el-tag type="success">{{item2.authName}}</el-tag> 
                    <i class="el-icon-caret-right"></i> 
                  </el-col>
                  <el-col :span="18">
                    <el-tag type="warning" 
                    v-for="item3 in item2.children" 
                    :key="item3.id" 
                    closable @close="removeRightById(scope.row , item3.id)">
                      {{item3.authName}}
                    </el-tag>
                  </el-col>
                </el-row>
              </el-col>
            </el-row>
              <!-- <pre>
                {{scope.row}}
              </pre> -->
          </template>
        </el-table-column>
        <!-- 索引列 -->
        <el-table-column type="index" label="#"></el-table-column>
        <el-table-column label="角色名称" prop="roleName"></el-table-column>
        <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
        <el-table-column label="操作" width="300px">
          <template slot-scope="scope">
            <el-button size="mini" type="primary" icon="el-icon-edit">编辑</el-button>
            <el-button size="mini" type="danger" icon="el-icon-delete">删除</el-button>
            <el-button size="mini"
              type="warning"
              icon="el-icon-setting"
              @click="showSetRightDialog(scope.row)"
              >分配权限</el-button>
          </template>
        </el-table-column>
      </el-table>
    </el-card>
    <!-- 分配权限的对话框  -->
    <el-dialog
      title="分配权限"
      :visible.sync="setRightDialogVisible"
      width="50%" @close="setRightDialogClosed">
      <!-- 树形控件 -->
      <el-tree :data="rightslist " 
        :props="treeProps" 
        show-checkbox 
        node-key="id" 
        default-expand-all 
        :default-checked-keys="defKeys" ref="treeRef">
        </el-tree>
      <span slot="footer" class="dialog-footer">
        <el-button @click="setRightDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="allotRights">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
  export default {
    data() {
      return {
        //所有角色列表区域
        rolelist: [],
        //控制对话框的显示与隐藏
        setRightDialogVisible: false,
        //所有权限的数据
        rightslist: [],
        //树形控件的属性绑定对象
        treeProps:{
          label: 'authName',
          children: 'children'
        },
        //默认选中的节点Id值数组
        defKeys: [],
        // 当前即将分配权限的角色id
        roleId: ''
      }
    },
    created() {
      this.getRolesList()
    },
    methods: {
      async getRolesList(){
        const {data:res} = await this.$http.get('roles')
        if(res.meta.status !== 200 ) {
          return this.$message.error('获取角色列表失败')
        }
        this.rolelist = res.data
        // console.log(this.rolelist);
      },
      //根据ID删除对应权限
      async removeRightById(role , rightId) {
        // 弹框提示用户是否要删除
        const confimResult = await this.$confirm('此操作将永久删除该文件, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).catch(err => err)
        if (confimResult !== 'confirm') {
          return this.$message.info({
            message:'取消了删除！',
            duration: 1000
          })
        }
        const {data:res} = await  this.$http.delete(`roles/${role.id}/rights/${rightId}`)
        if (res.meta.status !== 200 ){
          return this.$message.error('删除权限失败')
        }
        // this.getRolesList() 此方法会重新刷新页面
        role.children = res.data
      },
      //展示分配权限的对话框
      async showSetRightDialog(role) {

        this.roleId = role.id
        //获取所有权限数据
        const {data:res} = await this.$http.get('rights/tree')
        if(res.meta.status !==200 ){
          this.$message.error('获取权限失败')
        }
        //获取到的权限数据保存到 data 中
        this.rightslist = res.data
        // console.log(this.rightslist);
        // 递归获取三级节点的ID
        this.getLeafKeys(role, this.defKeys)
        this.setRightDialogVisible = true
      },
      //通过递归的形式，获取角色下所有三级权限的id，并保存到数组中
      getLeafKeys(node, arr) {
        // 如果当前node节点不包含children属性 则是三级节点
        if(!node.children){
          return arr.push(node.id)
        }
        node.children.forEach(item => 
        this.getLeafKeys(item, arr))
      },
      // 监听对话框的关闭事件
      setRightDialogClosed() {
        this.defKeys = []
      },
      //点击为角色分配权限
      async allotRights() {
        const keys = [
          ...this.$refs.treeRef.getCheckedKeys(),
          ...this.$refs.treeRef.getHalfCheckedKeys()
        ] 
        const idStr = keys.join(',')
        const { data:res } = await this.$http.post(`roles/${this.roleId}/rights` , {rids: idStr})
        if(res.meta.status !== 200) {
          return this.$message.error('分配权限失败')
        }
        this.$message.success({
          message:'分配权限成功',
          duration: 1500
        })
        this.getRolesList()
        this.setRightDialogVisible = false
      }
    }
  }
</script>
<style scoped>
  .el-tag {
    margin: 7px;
  }

  .bdtop {
    border-top: 1px solid #eee;
  }

  .bdbottom {
    border-bottom: 1px solid #eee;
  }

  .vcenter {
    display: flex;
    align-items: center;
  }
</style>
